woah! a big change from all the 4-cylinder talk that's been around. how accurate has your source been thus far?

Not every model moves from engineering tests to production. But if it does go into production, it always is exactly as specified.

The reason is simple: by the time I see a new model, its design is finalized. Possibly, option lists are not settled, and some tweaks can be made based on test results, but the general blueprint is there.